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Astra (Sanskrit: "Weapon") is an Indian family of all weather beyond-visual-range air-to-air missile, developed by the Defence Research and Development Organisation. Different missiles of this family are capable of engaging targets at varying distances of 500 m (0.31 mi) up to 340 km (210 mi). [ 15 ]
Mk VIII Bubble sextant in use on a Short Sunderland. Isaac Newton developed the quadrant. The octant was a further improvement. It could measure altitudes of up to 90° above the horizon. The first bubble instruments, which were developed by Gago Coutinho, were bubble sextants that copied the features of an ordinary sextant.
The frame of a sextant is in the shape of a sector which is approximately 1 ⁄ 6 of a circle (60°), [2] hence its name (sextāns, sextantis is the Latin word for "one sixth"). "). Both smaller and larger instruments are (or were) in use: the octant, quintant (or pentant) and the (doubly reflecting) quadrant [3] span sectors of approximately 1 ⁄ 8 of a circle (45°), 1 ⁄ 5 of a circle (72 ...
For that reason, Admiral John Campbell, who conducted shipboard experiments with the lunar distance method, suggested a larger instrument and the sextant was developed. [10] From that time onward, the sextant was the instrument that experienced significant development and improvements and was the instrument of choice for naval navigators.
A strike could test Trump’s skills as a “pro-business” president who also wants to protect the blue-collar jobs that were prominent 50 years ago but are growing scarce now.
A diagram of a typical nautical sextant, a tool used in celestial navigation to measure the angle between two objects viewed by means of its optical sight. Celestial navigation, also known as astronavigation, is the practice of position fixing using stars and other celestial bodies that enables a navigator to accurately determine their actual current physical position in space or on the ...
John Bird (1709– 31 March 1776) was a British mathematical instrument maker who was notable for inventing the sextant. [citation needed] He came to London in 1740 where he worked for Jonathan Sisson and George Graham. [1] By 1745, he had his own business in the Strand.
Crowded onto a lifeboat with a sextant and a copy of The American Practical Navigator this group of men were able to navigate their way from a thousand miles west of the Galapagos Islands to Hawaii in forty-three days. [1] Likewise, the Essex while off the west coast of South America was attacked by a whale and its crew shipwrecked.
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